Turbine-wheel.



0. F. BRUMAN.

TURBINE WHEEL.

APPLICATION FILED 11113.20, 1911.

Patented 0015.7, 1913.

clear, concise, and enact description.

. the disks turn outward, thereby forming a V- nickel steel or other suitable material and vfacture of the turbine Wheels and blades,

vThe disks are preferably .made slightlyl ren erstere OTTO F. BRUT/IAN, GF BERLIN, GERMANY, ASSIGNOR TO ROBERTS. HOTZ, 0F CICAGO,

7 ILLINOIS. I

To all whom t mag/'concern' l Be it known that'l, 'rro F. Bum/LAN, citizen of the .Republic of Switzerland, residing at Berlin, Germany, have invented a certain new and useful improvement in Turbine- VVheels, of which the following is a full,

My invention reiates to rotary turbine wheels, and more particularly to the structure of the Wheel disks and the blades or vanes, and to the manner Iin which said blades are attached to the turbine disks.

ri`he object of my invention is to simplify and render more economic-al the manuand to provide a Wheel and blade structure which shallbe both light and strong.

The wheel of my invention comprises two disks of pressed steel fastenedV together.

dished in shape with flanges formed both on the outer periphery and on the cent-ral aperture through which the shaft of the turbine passes. s

Another feature of my invention consists in making the flanges on the peripheries of telly or rim which may be notched to afford a method of securing the roots of the blades' Another feature of my invention relates I to the manner in which the blades are shaped. These blades are made of drawn have tangs or roots punched on them adapted `to tit in the notches on the rim of the wheel.

Still' another 'feature of the invention relates to the manner of securing the projections .on the blades to the rim of the Wheel and to the cover plate which surrounds the ends of the blades. The blades are inserted in place and the slightly projecting ends of the tangs are Welded to the rim and to the cover plate bythe autogeno-us method of welding. After the tangsare welded, they are preferably turned ott smooth, whereby the friction and eddies, which would othcr- Wise be set up by the 'projections in the sur rounding steam or other huid, are avoided.

These and other features of my invention may be more. readily understood by refer ence to the accompanying drawings, in which, i

Figure is a diametrical sectional vieu' otl a portion ...ie wheel on a reduced scale;

Specification of Letters atent.

Application led'March 20,

TURBINE-WHE'EL Patented Oct. 7, 1913.

1911. serial no. 615,540.

Fig. 9. is a fragmentary vieiv of the periphery of the Wheel, partly in section and part-ly broken away; Fig. 3 is a sectional view showing' the blades and the method ot attaching them to the wheel and the outer band; Fig. 4 is a side elevation of a portion of the'wheei, showingr three blades in place; and Fig. 5 is a plan View showing a. portion of the band which surrounds the outer end of the blades.

The blades l are secured on the periphery of the Wheel formed by the disks 2, 2 which are secured to the cent-ral hub 3. Around the outer ends of the blades is secured a band 4. The disks 'are secured to the hub by means of bolts 5 andthe blades have tangs or projections 6, 6 which it in slots 7, Tf in the rim of the wheel. Theblades also lhave projections 8 which t in slots 9 inthe outer band 4'.

The Wheel disks are-held together and stltfened by the rivets 5 and 12 and also by the tangs 6, 6. After the wheel disks are secured together and the blades inserted, the tangs 6,' G', may be treated by the autogenous Welding process so as to Weld the tangs securely to the rim of the wheel. After the outer bands 4 are put in place, the tangs 8 may also be Welded tothe bands by the aut-ogenous welding process.

then the turbine .wheel disks rotate in the steam or other iiuid, there is a considerable loss caused by the friction and eddies set up 'by projections such as would be made, for example, if the tangs 8 were left protrudingr beyond the outer band. By securely welding tangs S and 6, 6"'to the baud and rim respectively, these parts may be securely held even it the lprojecting portions oi the tangs are turned oit.

.ks is Well known a disk of uniform thickness, rotating; at a higli speed about a central axis, has stresses set up in it due to the centrifugal force. These stresses are great` est at the center ot the disk, and it the disk is perforated by a central hole, the stresses around the edges of this central hole are considerably greater'than it the disk wertl unj'ieriioratcd. lt will be noted that l prei:- erably utilize the material of the center por` tion of the disk to turn out into a iangc which 'forms a hub for the disk. in this way I utilize most eiliciently the metal of the disk and avoid the inet-case in stress which would occur it the disk were perforated for :i large number ot rivets or otherwise de erezised in section to provide e joint for securing it to :i separate hub.

eiierring to Figs. 2 sind 3, it will be noted that I preferably sharpen the edges ot the blades on the entering side, that is, the one on which the fluid ets irnpnge, as indicated at 1.3. This sharpening or bereling may be done on the working portion of the blade only, leaving the metal ot full section nt the tang 6.

It will be understood that various 1nodilications of my invention can be made Within the scope of the appended claims.

. I ela'nn:

l. In n turbine wheel, the combination with two disks secured together at their peripheries and having flanges forming a rim on said Wheel, said rim being provided With notches in the outer edges thereof, of blades having tangs ontheir` outer edges fitting in said notches and secured therein.

Q. In u turbine Wheel, the combination with two disks secured together et their peripheries and having Hanges -forming a rim on seid wheel, said rim being provided with notches on the outer edges thereof, of blades having tangs @n their outer edges fitting in said notches and seeuredvtherein, said blades being beveled on the entering side along the working portion of the blade.

In a turbine wheel, the combination with two disks secured together at their perpheries and having oppositely extendmg flanges forming e rim on said Wheel, said rim being provided with notches in the outer edges thereof, of blades having tangs on their outer edges fitting in .said notches and welded to said rim, e band covering the ends ot' seid blades, said bend being provided with notches therein and said blades being provided with tangs fitting in said notches and welded to said bend.

In Witness whereof, I, hereunto subscribe my name this 19 day of January A. D., 1911.

OTTO F. BRUMAN.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT. 

